Mitsubishi Electric MELSEC FX Series - Important Buffer Memory Locations

Learning to Use the FX Family for Positioning Control FX3U-20SSC-H positioning
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MITSUBISHI ELECTRIC
4.6.4 Important buffer memory locations
The FX 3U -20SSC-H buffer memory includes five separate data areas for: Monitor data, Control data,
Table data, Positioning parameter data, and Servo parameter data. With "read only" or "read/write"
access, buffer memory addresses use bit and word information to control positioning operations.
Similar to the FX
2N -10PG, a large percentage of the BFM is dedicated to the control of table position-
ing operations.
The following buffer memory addresses are used in the ladder program example below. For details on
other BFM addresses, refer to the FX
3U -20SSC-H User’s Manual (JY997D21301).
Monitor data Control data Table information Positioning parameters Servo parameters
Used to monitor the
current position, sta-
tuses, etc.
Used to control
positioning opera-
tions.
Used to store prede-
fined table data.
Used to store parameters
such as the max. speed
and accel/decel times.
Used to store parameters
relevant to the servo(s).
BFM Area BFM # Item Set value Note
Monitor data
#1, #0 X-axis current address D1, D0 PLS
#101, #100 Y-axis current address D101, D100 PLS
#28 X-axis status information D10 —
#128 Y-axis status information D110 —
Control data
#501, #500 X-axis target address 1 10,000,000 PLS
#503, #502 X-axis operation speed 1 2,000,000 Hz (PLS/sec)
#518
X-axis operation command 1 M0–M15 —
Bit 0 Error reset M0 X007
Bit 1 STOP M1 X006
Bit 2 Forward rotation limit M2 X000
Bit 3 Reverse rotation limit M3 X010
Bit 4 Forward rotation JOG(+) M4 X001
Bit 5 Reverse rotation JOG(-) M5 X002
Bit 6 Zero-return M6 X003
Bit 8 Relative/Absolute positioning M8 (Bit 8 = 1)
Relative
positioning
Bit 9 START command M9 X004, X005
#618
Y-axis operation command 1 M100–M115 —
Bit 0 Error reset M100 X007
Bit 6 Zero-return M106 X003
#519
X-axis operation command 2 M20–M35 —
Bit 4 Positioning parameter enable command M24 X001, X002
#520
X-axis operation pattern selection — —
Bit 0 1-speed positioning H1 X004
Bit 10 Table operation (simultaneous) H400 X005
#521 Table operation start number 0 Table row #0
Positioning
parameter data
#14013,
#14012
X-axis JOG speed 1,000,000 Hz (PLS/sec)
Tab. 4-39: Buffer memory addresses of FX 3U -20SSC-H